摘要
焦化汽油辛烷值低、安定性差,烯烃和硫含量高,不能作为汽油的调合组分直接出厂。随着国家对环境保护的日益重视,对汽油的质量要求不断提高,需要采用简单易行的加工方法对焦化汽油进行改质,提高其辛烷值、降低烯烃和硫含量,同时加工损失又较小。中国石化洛阳工程公司研发的FDFCC-Ⅲ工艺,由于设置第二提升管,对于加工焦化汽油具有独特优势。第二提升管为焦化汽油催化改质反应提供了独立的反应场所,可以灵活、多方案地实现焦化汽油的加工。在改质反应温度550℃条件下,焦化汽油经第二提升管改质后,汽油保留率为72.78%,液化石油气+改质汽油+柴油收率为94.44%,焦炭产率为2.21%,干气产率为2.72%。同时汽油性质得到明显改善,RON辛烷值提高11个单位,脱硫率达到78.0%,脱氮率达到91.8%,且改质汽油烯烃含量大幅度下降,诱导期延长,为焦化汽油的利用提供了一条简单易行的工艺路线。
Coker naphtha has low octane value,poor safety and high contents of olefin and sulfur and therefore cannot be directly used as a gasoline blending component.As it attaches increasing importance to envi-ronmental protection,China has increasingly strict requirements for the quality of gasoline.Refiners need to up-grade coker naphtha to increase its octaine value,reduce olefin and sulfur contents and lower processing loss using simple and easy procesing methods.The FDFCC- Ⅲ process developed by Sinopec Luoyang Engineering Company has its unique advantages over other similar products when used for processing coker naphtha as it is equipped with a second riser.The addition of the second risr has provided a standalone reaction place for the catalytic upgrade of coker naphtha,enabling flexible and multiple ways of coker naphtha processing.When the reaction temperature is 550 ℃,the gasoline retention rate after coker naphtha was upgraded through the second riser reaches 72.78%,the combined yield of LPG,upgrade gasoline and diesel fuel is 94.44%,the coke yield is 2.21% and the dry gas yield is 2.72%.The properties of gasoline improved considerably — RON increased by 11 units,78.0% of sulfur was removed,and 91.8% of nitrogen was removed.In addition,the content of olefin in the upgraded gasoline dropped significantly and the induction period extended.The up-grade has offered a simple and easy route for the utilization of coker naphtha.
引文
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